Electric pocket-lamp



J O. JUNGHANS.

ELECTRIC POCKET LAMP.

APPLICATION FILED OCT. 10, 19l6.

1,367,781. Patented Feb. 8,1921.

UNITED STATES PATENT OFFICE.

J OSKAR JUNGHANS, OI SCHRAMBERG, GERMANY.

ELECTRIC POCKET-LAMP.

Specification of Letters Patent.

Patented Feb. 8, 1921.

Application filed October 10, 1916. Serial No. 124,915.

' the armature is constructed, as a rule, of the double-pole type. Such armatures, however, have the disadvantage that the poles will adjust themselves in the direction of the lines of force of the magnet when the rotation ceases. When the gearing of the lamp is to be started, first the maximum resistance of the'armature will have to be overcome, so that an easy starting of the gearing is prevented. According to the present invention,

a three-pole armature has, therefore, been employed, which, as will be obvious, will start equally well at all positions because its poles can neveradjust themselves in the direct line connecting the two poles of the magnet. In order to avoid the disadvantages which are encountered in the connection of the individual turns, when an alternating current is to be employed, what is desirable with regard to the lesser sensitiveness of the lamp, one of the poles of the armature is not wound with wire, andis only weighted by any other suitable means without the use of wire, so that a uniform balance is secured.

An example of the invention is shown in the accompanying drawing, wherein- Figures 1 and 2 illustrate a form of lampv with a special armature, according to the present invention, being respectively a top and side elevation, with parts broken away and in section. I

In said drawing, numeral 1 designates the hand-lamp having a lamp or bulb 2, an opcrating lever 3, a permanent field magnet 4, an armature 5, and gearing 6 for driving said armature.

The armature is a three-pole armature, the two poles 29 and 30 only having wire windings, while the pole 31 is weighted, in

a suitable manner, so as to secure auniform balancing.

With an armature of this type. theadvantages of a three-pole armature, regarding an easystarting, are combined with the better connections of a two-pole armature for pocket lamps, and a considerable improvement in the manipulation and the efiiciency of such lamps is secured.

The invention may receive other embodiments than that herein specifically illustrated and described.

What is claimed is A manually-operated dynamo hand lamp, comprising a bipolar field magnet, and a tri-polar armature, two of said armature poles having windings, and one of said armature poles being unwound, and means for producing a relative movement of said magnet and armature.

In witness whereof I have hereunto signed my name in the presence of two subscribing witnesses.

DR. OSKAR JUNGHANS.

Witnesses:

FRIDA KLAIBER, CONRAD KRAUSS. 

